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resize2fs: disable the meta_bg feature if necessary 

When shrinking a file system, if the number block groups drops below
the point where we started using the meta_bg layout, disable the
meta_bg feature and set s_first_meta_bg to zero.  This is necessary to
avoid creating an invalid/corrupted file system after the shrink.

Addresses-Debian-Bug: #756922

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Marcin Wolcendorf <antymat+debian@chelmska.waw.pl>
Tested-by: Marcin Wolcendorf <antymat+debian@chelmska.waw.pl>
test-maint
Theodore Ts'o 2014-08-09 12:33:11 -04:00
parent 7a4352dccd
commit c82815e509
1 changed files with 13 additions and 4 deletions
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17
resize/resize2fs.c
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@ -489,6 +489,13 @@ retry:
fs->super->s_reserved_gdt_blocks = new;
}
if ((fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) &&
(fs->super->s_first_meta_bg > fs->desc_blocks)) {
fs->super->s_feature_incompat &=
~EXT2_FEATURE_INCOMPAT_META_BG;
fs->super->s_first_meta_bg = 0;
}
/*
* Update the location of the backup superblocks if the
* sparse_super2 feature is enabled.
@ -998,13 +1005,15 @@ static errcode_t blocks_to_move(ext2_resize_t rfs)
ext2fs_mark_block_bitmap2(rfs->reserve_blocks, blk);
}
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
if (old_fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
old_blocks = old_fs->super->s_first_meta_bg;
else
old_blocks = old_fs->desc_blocks +
old_fs->super->s_reserved_gdt_blocks;
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
new_blocks = fs->super->s_first_meta_bg;
} else {
old_blocks = old_fs->desc_blocks + old_fs->super->s_reserved_gdt_blocks;
else
new_blocks = fs->desc_blocks + fs->super->s_reserved_gdt_blocks;
}
retval = reserve_sparse_super2_last_group(rfs, meta_bmap);
if (retval)